红宝石二维阵列：寻找一个对象的坐标 [英] Ruby two dimensional array: finding an object's coordinates

问题描述

假设，我有一个二维数组 A ，它的指出，地方里面有一个对象 my_element 。什么是找出其坐标的最快方法？我使用Ruby 1.8.6。

Assume, I have a two dimensional array A, and it's stated that somewhere inside it there's an object my_element. What's the quickest way to find out its coordinates? I am using Ruby 1.8.6.

推荐答案

这是一种方式。我不知道这是最快的，虽然。

This is one way. I'm not sure it's the quickest, though.

class Array
  def coordinates(element)
    each_with_index do |subarray, i|
      j = subarray.index(element)
      return i, j if j
    end
    nil
  end
end


array = [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ]
array.coordinates(3)     # => [0, 2]
array.coordinates(9)     # => [2, 2]
array.coordinates(42)    # => nil

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